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Application Note 34

RTCT

    • 3.75

      V

    • 3.1

      V

    • 2.6

      V

    • 1.8

      V

    • 1.25

      V

CLK

TIME

PWM MAX DUTY

TIME

PFC

OUT

TIME

TIME

Figure 14. BL4824-2 Timing Diagram.

    • 2.5

      V

      • +

        U1

50µA

5

SS

Q4

REF

13 VCC

13.5V SHUNT REGULATOR

V

FB 15

+

DCOK

U17

Q2A

Q2B

UV

VDC 6

RAMP 2 8

1.25V

  • +

    U7

+

CMP

Q3

REF

U22 DUTY LIMIT

Q1

Figure 15. D.C. O.K. Comparator, PWM Comparator, and Soft Start.

10

REV. 1.0 11/17/2000

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